Things You'll Need
- Measuring tape
- Calculator
Instructions
Measure your tank's height, length and width using a measuring tape and write these numbers down. The height is from the top of the tank to the bottom. The length is from right to left and the width is from front to back.
Multiply the numbers together using your calculator to get the total volume in square inches.
Multiply that number by .00433 to get the number of gallons your tank holds.
Multiply this number by 3.7854 to get the number of liters your tank holds.